/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.visitor;

import proguard.classfile.ClassPool;

/**
 * This ClassPoolVisitor delegates all visits to each ClassPoolVisitor in a given list.
 *
 * @author Eric Lafortune
 */
public class MultiClassPoolVisitor implements ClassPoolVisitor {
    private static final int ARRAY_SIZE_INCREMENT = 5;

    private ClassPoolVisitor[] classPoolVisitors;
    private int classPoolVisitorCount;

    public MultiClassPoolVisitor() {}

    public MultiClassPoolVisitor(ClassPoolVisitor[] classPoolVisitors) {
        this.classPoolVisitors = classPoolVisitors;
        this.classPoolVisitorCount = classPoolVisitors.length;
    }

    public void addClassPoolVisitor(ClassPoolVisitor classPoolVisitor) {
        ensureArraySize();

        classPoolVisitors[classPoolVisitorCount++] = classPoolVisitor;
    }

    private void ensureArraySize() {
        if (classPoolVisitors == null) {
            classPoolVisitors = new ClassPoolVisitor[ARRAY_SIZE_INCREMENT];
        } else if (classPoolVisitors.length == classPoolVisitorCount) {
            ClassPoolVisitor[] newClassPoolVisitors =
                new ClassPoolVisitor[classPoolVisitorCount + ARRAY_SIZE_INCREMENT];
            System.arraycopy(classPoolVisitors, 0, newClassPoolVisitors, 0, classPoolVisitorCount);
            classPoolVisitors = newClassPoolVisitors;
        }
    }

    // Implementations for ClassPoolVisitor.

    public void visitClassPool(ClassPool classPool) {
        for (int index = 0; index < classPoolVisitorCount; index++) {
            classPoolVisitors[index].visitClassPool(classPool);
        }
    }
}
